nr2-630g-630 chint thermal overload relay, 400a to 630a rated current

Why Choose the CHINT NR2-630G-630 Thermal Overload Relay?

The CHINT NR2-630G-630 is a heavy-duty thermal overload relay engineered to provide dependable overload and phase failure protection for large three-phase AC motors used in industrial automation and power distribution systems. As part of the advanced CHINT NR2 thermal overload relay series, this relay is specifically designed for demanding high-current motor control applications where operational continuity and equipment protection are essential.

Built with a precision three-phase bimetal tripping mechanism, the NR2-630G-630 continuously monitors motor current and disconnects the circuit when overload or abnormal operating conditions occur. Integrated temperature compensation, phase loss sensitivity and selectable reset functionality help minimise motor damage, reduce maintenance costs and improve system reliability.

With an adjustable current range of 400 A to 630 A, the NR2-630G-630 is ideal for protecting large industrial motors used in pumps, compressors, conveyor systems, HVAC installations and heavy-duty manufacturing equipment. The relay is designed for use with compatible CHINT NC2 series contactors and industrial motor starter assemblies.

Key Advantages

• Reliable thermal overload and phase failure protection.
• Adjustable current range from 400 A to 630 A.
• Designed for use with CHINT NC2 high-current contactor systems.
• Integrated manual and automatic reset operation.
• Heavy-duty construction for industrial motor applications.
• Temperature compensated tripping improves protection stability.

Key Features

• CHINT NR2 thermal overload relay series.
• 400 A to 630 A adjustable overload current setting.
• Three-phase thermal bimetal protection.
• Integrated phase loss sensitivity.
• Manual and automatic reset selector.
• Test and stop push buttons.
• 1 NO + 1 NC auxiliary contacts.
• Independent mounting design for high-current motor control systems.

Technical Specifications

• Manufacturer: CHINT
• Series: NR2 Thermal Overload Relay
• Model: NR2-630G-630
• Product type: Thermal overload relay
• Current adjustment range: 400 A to 630 A
• Rated operational voltage: Up to 690 V AC
• Frequency: 50 / 60 Hz
• Tripping class: Class 10A
• Protection functions: Overload and phase failure protection
• Auxiliary contacts: 1 NO + 1 NC electrically isolated
• Reset mode: Manual / Automatic selectable
• Mounting type: Independent mounting
• Protection rating: IP20 when enclosed
• Mechanical life: ≥ 1,000,000 operations
• Electrical life: ≥ 100,000 operations
• Compliance standards: IEC/EN 60947-4-1

Heavy-Duty Protection for Large Industrial Motors

Thermal overload relays are essential for protecting industrial motors against overheating caused by excessive current draw, mechanical overload or phase imbalance. The CHINT NR2-630G-630 continuously monitors motor operating current and trips the associated contactor when unsafe operating conditions are detected.

The NR2-630 series is designed for high-current industrial applications where dependable motor protection and operational continuity are critical. Its robust construction and high-current capability make it suitable for large-scale industrial automation systems and heavy-duty motor control installations.

Typical Applications

• Large industrial motor starter assemblies.
• Heavy-duty conveyor and material handling systems.
• Industrial pumps and compressor systems.
• HVAC and ventilation motor protection.
• Manufacturing and processing equipment.
• Industrial automation and power distribution systems.

Trusted by Industrial Engineers Worldwide

CHINT NR2 thermal overload relays are widely used in industrial automation and heavy-duty motor control applications to deliver dependable overload protection and reliable long-term system performance.